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Effects of Age on \( (\dot V{O_2}) \) Kinetics During Calf and Cycling Exercise

  • P. D. Chilibeck
  • D. H. Paterson
  • D. A. Cunningham
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 393)

Abstract

The kinetics of oxygen uptake \((\dot V{O_2})\)adjustment to moderate intensity cycling exercise are slowed as a function of age (1,5). This implies that older individuals must rely on anaerobic systems, to a greater extent, to meet energy requirements during transitions to exercise, increasing the possibility of early fatigue. The purpose of this study was to compare \(\dot V{O_2}\) kinetics between old and young subjects during an exercise of a smaller muscle mass (ankle plantar flexion). Ankle plantar flexion was performed using an ergometer, developed to measure kinetics with 31P-nuclear magnetic resonance spectroscopy (NMRS), where phosphocreatine kinetics correspond to muscle respiratory kinetics (3,10,15). Since plantar flexor muscles of older individuals have decreased capillarization and oxidative enzyme activity (4,7) and a greater amount of “non-muscle” tissue than young (14), we expected to find a slow oxygen delivery, or oxygen utilization at the start of exercise. This would result in an impairment of \(\dot V{O_2}\) kinetics with age.

Keywords

Plantar Flexion Plantar Flexor Cycling Exercise Cycle Ergometry Oxidative Enzyme Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • P. D. Chilibeck
    • 1
  • D. H. Paterson
    • 1
  • D. A. Cunningham
    • 1
  1. 1.The Centre for Activity and Ageing Faculties of Kinesiology and MedicineThe University of Western OntarioLondonCanada

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